As mobile wireless data and 4G LTE networks have increased, so has the need for new spectrum bands to accommodate wireless traffic. While 3G networks used five bands, there are already over 20 4G LTE bands; this number will rise to more than 40 in the near future.
In fact, a smartphone for international use could filter transmit and receive paths for 2G, 3G and 4G in up to 15 bands, as well as Wi-Fi, Bluetooth and global navigation satellite system (GNSS). Such a phone may require as many as 30-40 filters.
Qorvo innovations in bulk acoustic wave (BAW) technology are a vital component in advanced filtering solutions for mobile products, as well as the world's most advanced radar and communications systems.
As next-generation high-end smartphones and devices require even more filters, Qorvo can help. With low insertion loss and extremely precise selectivity, Qorvo's BAW filters can help solve the toughest interference and coexistence challenges worldwide. They also enable operators and manufacturers to deliver higher speeds and greater bandwidth by utilizing spectrum that might be lost with older filtering technologies.
Besides mobile products, Qorvo's BAW innovations in advanced radar and communications systems are driven through R&D with partners such as Lockheed Martin. Qorvo BAW filters are also used in base stations, repeaters and distributed antenna systems (DAS), tower-mounted amplifiers and many other wireless infrastructure and Wi-Fi customer premise equipment (CPE) applications.
Additionally, by integrating active and passive components into tiny modules, Qorvo uses innovations such as CuFlip™ and wafer level packaging (WLP) to deliver size, cost and performance advantages.
Although surface acoustic wave (SAW) and Qorvo's LowDrift™ and NoDrift™ SAW filters are well suited for applications up to about 1.5 GHz, BAW filters generally deliver superior performance with lower insertion loss at higher frequency levels.
BAW filters are inherently less sensitive to temperature change than standard SAW filters. LowDrift and NoDrift BAW reduce temperature sensitivity even further, making this technology ideal for extremely challenging applications in frequency ranges handled by BAW.
As you can see in the figure below, BAW is the best choice for multiplexer filter designs as you move up (to the right) in frequency, because the SAW bulk radiation acoustic energy is larger than BAW in the upper frequency spectrum.
Learn more about how smartphone designers consider regional and carrier requirements, as well as global roaming for high-end next-generation devices. Filter requirements vary in each region or country because of local differences in spectrum allocation, and the situation will only become more complicated as more LTE bands are allocated.
Qorvo’s LowDrift™ and NoDrift™ SAW and BAW filter technologies dramatically reduce temperature sensitivity and enable a better user experience.
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